CN209836441U

CN209836441U - Single-drafting-channel hollow spindle fancy yarn forming device

Info

Publication number: CN209836441U
Application number: CN201920321894.2U
Authority: CN
Inventors: 薛元; 高卫东
Original assignee: Jiangnan University
Current assignee: Jiangnan University
Priority date: 2019-03-13
Filing date: 2019-03-14
Publication date: 2019-12-24
Anticipated expiration: 2029-03-14

Abstract

The utility model provides a single-drafting-channel hollow spindle fancy yarn forming device, which comprises a drafting channel and a first auxiliary channel; a first twisting point and a second twisting point are arranged on the channel; the first component yarn and the second component yarn are alternately twisted by the first twisting point to form a fancy yarn main body; and a hollow spindle is arranged at the second twisting point, the fancy yarn main body penetrates through the hollow spindle, the hollow spindle rotates rapidly, and the fixed yarn on the hollow spindle is intersected with the fancy yarn main body and wraps the fancy yarn main body. The utility model discloses a one-step method spinning of fancy yarn, through the speed of regulation and control decoration yarn and core yarn in coordination with the feeding twist point, the linear density and the blending ratio of regulation and control decoration yarn, the twist of regulation and control core yarn simultaneously, the color of regulation and control core yarn and decoration yarn's switching etc. technical means realizes fancy yarn bamboo joint, big tripe, knot, circle, pigtail and the online change of form, expands the new variety of style yarn.

Description

Single-drafting-channel hollow spindle fancy yarn forming device

Technical Field

The utility model belongs to the technical field of spinning technique among the textile engineering and specifically relates to a hollow spindle fancy yarn forming device of single draft passageway is related to.

Background

The hollow spindle spinning machine usually adopts a two-step method for producing fancy yarns, and in the first step, core yarns, decorative yarns and solid yarns are respectively spun; and secondly, false twisting the core yarn and the decoration yarn fed at different speeds by using a hollow spindle device, twisting the decoration yarn on the core yarn to form patterns such as knots, loops, braids and the like by overfeeding the core yarn through the decoration yarn, and then binding and fixing the formed patterns by using the fixing yarn unwound from the hollow spindle to form the hollow spindle pattern type yarn. The main problems of the hollow spindle spinning machine for producing fancy yarn are as follows:

1) when the hollow spindle is used for spinning fancy yarns, the color change of the fancy yarns cannot be regulated and controlled: in order to realize the color change of the fancy yarn, one is to regulate and control the mutual wrapping relation of the decorative yarn, the core yarn and the fixed yarn, and the other is to regulate and control the color of the decorative yarn. The traditional hollow spindle spinning machine for producing fancy yarns is still lack of means for regulating and controlling the mutual wrapping relation of decorative yarns, core yarns and solid yarns, and the color of the decorative yarns cannot be regulated and controlled, so that the color change of the fancy yarns cannot be regulated and controlled;

2) the size and color change of knots, loops and braids can not be regulated and controlled when the hollow spindle is used for spinning fancy yarns: the hollow spindle fancy thread comprises three components (core yarn, decorative yarn and yarn fixing), wherein the decorative yarn is a main body for forming fancy thread knots, loops and braids, and the traditional hollow spindle spinning machine cannot regulate and control the thickness and the color change of the decorative yarn on line, so that the size and the color change of the knots, the loops and the braids cannot be regulated and controlled;

3) when the hollow spindle is used for spinning the three-thread fancy yarn comprising the (core yarn, the decoration yarn and the solid yarn), only simple combination of one decoration yarn and one core yarn can be realized, and a multiple combination mode of a plurality of decoration yarns and a plurality of core yarns can not be realized, so that the online regulation and control of the combination mode of the decoration yarns and the core yarns can not be realized.

4) When the fancy yarn is spun by the hollow spindle, the change of the cladding ratio of the core yarn, the decoration yarn and the solid yarn can not be regulated and controlled: when a three-thread fancy yarn containing (core yarn, decorative yarn and solid yarn) is spun by a hollow spindle, a regulating means is lacked in the process of twisting the core yarn and the decorative yarn and then coating the core yarn and the decorative yarn by the solid yarn, so that the change of the coating ratio of the core yarn, the decorative yarn and the solid yarn cannot be regulated and controlled on line.

5) Low efficiency, high production cost and the like. Because the hollow spindle spinning machine has the problems, the wrapping structure, the shape, the color, the style and the hand feeling of the fancy yarn are difficult to change on line through the regulation and control of spinning equipment and a spinning process in the spinning process of the fancy yarn, and the requirements of fancy yarn garment materials with various shape changes, rich and exquisite colors and agile style cannot be met.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a device and one-step method forming method of hollow spindle spinning fancy yarn of binary channels, through technologies such as reversal draft-carry in coordination-mutual twining and cladding, decorate yarn, core yarn and solid yarn combination and make up into the complicated fancy yarn that contains combination flower type such as knot, circle, pigtail to solve at least one technical problem that exists among the prior art.

In order to solve the technical problem, the utility model provides a single-drafting-channel hollow spindle fancy yarn forming device, which comprises a drafting channel for the first component yarn to pass through and a first auxiliary channel for the second component yarn to pass through; the drafting channel is sequentially provided with a rear roller, a middle roller, a first front roller, a first twisting point and a second twisting point; the first auxiliary channel is sequentially provided with a second front roller, the first twisting point and the second twisting point;

the area among the rear roller, the middle roller and the first front roller on the drafting channel is a drafting area, and an interactive twisting triangular area is formed among the first front roller, the second front roller and the first twisting point; the first front roller and the second front roller respectively move independently and respectively introduce the corresponding component yarns into the interactive twisting triangular area; one or two of the first component yarn and the second component yarn are led to the alternating twisting triangular area and then twisted to form a fancy yarn main body;

and a hollow spindle is arranged at the second twisting point, the fancy yarn main body penetrates through the hollow spindle, the hollow spindle rotates rapidly, and the fixed yarn on the hollow spindle is intersected with the fancy yarn main body and wraps the fancy yarn main body.

The utility model discloses break through the technical bottleneck of hollow spindle spinning in the aspect of fancy yarn shaping, implement the reversal draft through the one-step method, in coordination with the output, alternately twine and twist and cladding technology, fancy yarn (containing core yarn, decoration yarn and solidus) one-step method system of spinning has been realized, simultaneously through the output speed of regulation and control decoration yarn and core yarn, the linear density and the blending ratio of regulation and control decoration yarn, the twist of regulation and control core yarn, technological means such as the switching of regulation and control core yarn and decoration yarn realize fancy yarn slub, big tripe, the knot, the circle, the color of braid and the online change of form, expand the new variety of fancy yarn.

The yarn fixing device further comprises a filament bobbin, the filament bobbin is sleeved on the hollow spindle and synchronously rotates along with the hollow spindle, and the fixed yarn is wound on the filament bobbin.

Further, the hollow spindle comprises a false twister for twisting the fancy yarn main body.

Further, the back roller and the middle roller are connected through a first transmission gear set, and the first transmission gear set is used for keeping the traction ratio (linear velocity ratio) between the middle roller and the back roller constant and not more than 1.4.

The utility model provides a form one-level draft unit (be first draft district) between well roller and the back roller, preceding roller and well roller constitute second grade draft unit (be the second draft district), and the well, back roller velocity ratio of same passageway is invariable and be less than1.4, synchronously changing speed relative to the front roller in the channel, and alternately changing speed of the middle roller and the back roller in different channels relative to the front roller to realize alternating drafting of the first component yarn. Of particular importance is the fact that the primary draft is a pre-draft, the primary draft ratio e_hConstant C is constant draft, draft ratio e of primary draft_hC is less than or equal to 1.4, the continuity of the roving can be ensured, and no drafting singular point can be generated in the first drafting zone. Meanwhile, the fiber in the roving can be straightened, tensioned and oriented in the pre-drafting process, so that the preparation for slippage in the main drafting process is made, the end breakage rate or the singular point rate in the main drafting process is reduced, the drafting and twisting process is more stable, and the labor intensity of workers is greatly reduced.

Further, the first front roller and the second front roller are coaxial and can rotate relatively in the circumferential direction. Wherein preferably the first component yarn is a roving and the second component yarn is a core yarn.

Further, the yarn package also comprises a third component yarn and a second auxiliary channel for the third component yarn to pass through; a third front roller, the first twisting point and the second twisting point are sequentially arranged on the second auxiliary channel; one or two of the first component yarn, the second component yarn and the third component yarn are led to the alternating twisting triangular area and then twisted to form the fancy yarn main body.

Further, the third front roller and the second front roller are relatively fixedly arranged in the circumferential direction.

Further, the first auxiliary channel further comprises a first leading-out roller (a first unwinding shaft), and the first leading-out roller, the second front roller, the first twisting point and the second twisting point are sequentially arranged;

and/or the second auxiliary channel further comprises a second leading-out roller (a second unwinding shaft), and the second leading-out roller, the third front roller, the first twisting point and the second twisting point are sequentially arranged.

Preferably, an upper middle leather roller is correspondingly arranged above the middle roller, the yarn forming device further comprises an upper leather ring which is sleeved on the upper middle leather roller and the upper pin and keeps synchronous motion with the middle roller, and a lower leather ring which is sleeved on the middle roller and the lower pin and keeps synchronous motion with the middle roller; the distance between the holding jaw of the upper leather ring and the holding jaw of the lower leather ring and the front roller jaw line is less than 3 mm.

Two stage draft e_qFor dynamic main drafting, the speed of the middle roller is changed relative to the front roller, when the blending ratio K of the first component yarn in the drafting channel is 0%, the second-level drafting ratio e of the channel yarn_qWhen the distance delta between the channel yarn and the jaw of the front roller is not more than 3mm, the channel yarn forms a drafting singular point in the second drafting zone, the distance delta between the drafting singular point and the jaw of the front roller is not more than 3mm (in the prior art, the spacing between the back roller and the middle roller is generally more than 25mm, the drafting singular point position of the first drafting zone is randomly distributed between the middle roller and the back roller, when the drafting singular point distance exceeds 3mm from the jaw of the middle roller, the time for the drafting singular point to be fed into the jaw of the middle roller again has an uncertain factor, if the matching is not good, coarse details are generated, or the spinning ends are broken, so that the spinning becomes an unstable process, and the spinning reliability and the yarn quality are influenced). When K is gradually increased, the slivers held by the upper and lower leather rings are instantaneously fed into the jaw of the front roller to carry out secondary drafting along with the synchronous start of the rear roller and the middle roller, so that the drafting singular points in a secondary drafting zone can not influence the stability of spinning.

Furthermore, the device also comprises a rear roller shaft, a middle roller shaft and an auxiliary shaft;

the rear roller is movably sleeved on the rear roller shaft in a relative rotation way (for example, in a bearing way) in the circumferential direction of the rear roller shaft;

in the circumferential direction of the middle roller shaft, the middle roller can be movably sleeved on the middle roller shaft in a relative rotation manner;

the first transmission gear set comprises a first driving gear, a first intermediate gear and a first driven gear which are sequentially meshed for transmission; the first driving gear is fixedly connected with the rear roller in a coaxial manner, and the first driven gear is fixedly connected with the middle roller in a coaxial manner;

the first intermediate gear is sleeved on the auxiliary shaft relatively and fixedly.

Therefore, the rear roller and the middle roller can be synchronously driven to run through the auxiliary shaft, and the feeding speed of the first component yarn is further adjusted.

Further, the device also comprises a front roller shaft;

in the circumferential direction of the front roller shaft, the first front roller is sleeved on the front roller shaft relatively and fixedly; the second front roller and the third front roller can be sleeved on the front roller shaft in a relatively rotating manner.

Further, the roller type roller mechanism further comprises a second front shaft, and the second front shaft is connected with the second front roller through a second gear transmission pair; the second front shaft is connected with the third front roller through a third gear transmission pair; the second front roller and the third front roller can be synchronously driven to rotate through the second front shaft.

Further, the second gear transmission pair includes: the second main gear and the second auxiliary gear are in meshed transmission with each other, the second main gear is fixedly sleeved on the second front shaft, and the second auxiliary gear is fixedly connected with the second front roller in a coaxial manner;

the third gear transmission pair includes: a third main gear and a third pinion which are in meshed transmission with each other, wherein the third main gear is fixedly sleeved on the second front shaft, and the third pinion is fixedly connected with the third front roller in a coaxial manner.

Wherein the back roller, the middle roller and the front roller are preferably nested rollers. Wherein, each back roller, middle roller and preceding roller top correspond respectively to be provided with the epitheca roller, and the epitheca roller is used for grasping the yarn with the roller cooperation of below.

Further, the device also comprises a control system and a servo driving system; the servo driving system comprises a servo driver and a servo motor; the control system comprises a controller and a rotating speed sensor;

the controller is connected with the servo motor through the servo driver in sequence;

the servo motor includes: the first servo motor is used for driving the front roller shaft, the second servo motor is used for driving the second front shaft, the third servo motor is used for driving the auxiliary shaft to rotate, the fourth servo motor is used for driving the first extraction roller to rotate, the fifth servo motor is used for driving the first extraction roller to rotate, and the hollow spindle motor is used for driving the hollow spindle to rotate;

the rotation speed sensor includes: the first sensor, the second sensor, the third sensor, the fourth sensor and the fifth sensor are respectively used for monitoring the rotating speeds of the front roller shaft, the second front shaft, the auxiliary shaft, the first leading-out roller and the second leading-out roller, and the hollow spindle sensor is used for monitoring the rotating speed of the hollow spindle.

The utility model provides a controller loops through the feeding speed of four component yarns on four yarn passageways of servo driver and servo motor control, and the actual feeding speed of four component yarns of rotational speed sensor real-time supervision to feed back the monitoring value to the controller, the controller can be according to the size of control signal on four yarn passageways of monitoring value adjustment.

Furthermore, the twisting mechanism comprises a ring plate, and the controller controls the ring plate to move through a servo driver and a servo motor. In addition, the control system also includes a series of instructions and modular programs.

The control system further comprises a first comparison module, the first comparison module is respectively connected with a third sensor, a fourth sensor, a fifth sensor and the controller, the first comparison module is used for monitoring the rotation speed ratio among the auxiliary shaft, the first leading-out roller and the second leading-out roller, and the controller regulates and controls the rotation speed of the auxiliary shaft, the first leading-out roller and the second leading-out roller according to a numerical value fed back by the first comparison module, so that the blending ratio of the first component yarn, the second component yarn and the third component yarn is regulated and controlled.

Further, the outer diameter sizes of the first front roller, the second front roller and the third front roller are the same.

Adopt above-mentioned technical scheme, the utility model discloses following beneficial effect has:

the utility model provides a pair of adopt hollow spindle fancy yarn forming device of above-mentioned single draft passageway, have two tunnel spinning passageways and two hollow spindle spinning systems of twist point through the construction, accomplish mutual twist and form fancy yarn main part at first twist point (first twist point department), carry out the cladding twist by the solid yarn of output and the fancy yarn main part that has taken shape at second twist point (second twist point department), form the fancy yarn that contains decorations yarn, core yarn and solid yarn, realize the spinning of the hollow spindle fancy yarn of solid one-step process, the heart yearn, the solid yarn.

In addition, by regulating and controlling the speed of the rear roller, the middle roller and the three front rollers to cooperatively change, fancy yarns with multiple structures such as single-twist coating, alternate-twist coating, winding-twist coating and the like are spun; and through regulating and controlling the speed of the back roller, the middle roller and the three front rollers to change cooperatively, the combination of the decoration yarn and the core yarn is changed online, the combination of patterns such as knots, braids and loops is changed online, the sizes of the patterns such as the knots, the braids and the loops are changed online, the colors of the patterns such as the knots, the braids and the loops are changed online, and the combined fancy yarn with changeable appearance forms is spun; finally, the coating ratios of the core wire, the decoration wire and the solid wire are regulated and controlled by regulating and controlling the speeds of the rear roller, the middle roller and the three front rollers to cooperatively change, the colored fancy yarns with online color change are spun, and the production efficiency is greatly improved.

In addition, the utility model also discloses a fancy yarn forming method of adopting above-mentioned hollow spindle fancy yarn forming device of single draft channel.

The utility model discloses a hollow spindle spinning device comprises the core yarn passageway of the draft passageway of roving and two way staple fiber yarn (or filament) and cladding yarn passageway all the way. The roving is subjected to alternating drafting to form untwisted strands with variable thickness, the untwisted strands are output by a drafting channel and are intersected with the yarns (or filaments) output by the other two core yarn channels at a first twisting point, and under the action of twisting effect, the three strands are twisted alternately to form a fancy yarn main body; due to the effect of the hollow spindle twisting, the solid yarn (or filament) and the main body of the formed fancy yarn are subjected to cladding twisting at the second twisting point, so that the fancy yarn comprising the decoration yarn, the core yarn and the solid yarn is formed, and the spinning of the hollow spindle fancy yarn in one step of decoration yarn, core yarn and solid yarn is realized.

Further, by adjusting and controlling the speed of the rear roller, the middle roller and the three front rollers on line, the fancy yarns with the single-twist coating structure, the fancy yarns with the alternate-twist coating structure and the fancy yarns with the winding and twisting coating structure can be respectively spun by the input decorative yarns and the core yarns in a coordinated manner;

twisting an untwisted strand or yarn through the drafting channel, the first auxiliary channel or the second auxiliary channel at the first twisting point, and covering the untwisted strand or yarn at the second twisting point by the fixed yarn to form a single-twist covered structured fancy yarn;

two untwisted strands or yarns are respectively led into the alternating twisting triangular area through two channels of the drafting channel, the first auxiliary channel or the second auxiliary channel, and are twisted at a non-constant speed at the first twisting point, and then are wrapped by the fixed yarns at the second twisting point to form fancy yarns with an alternating twisting and wrapping structure;

three untwisted strands or yarns are respectively led into the interactive twisting triangular area through the drafting channel, the first auxiliary channel and the second auxiliary channel, and are twisted at a non-constant speed at the first twisting point, and then are wrapped by the fixed yarns at the second twisting point to form the fancy yarn with a twisting and wrapping structure.

Further, it is set that the speeds of the first front roller, the second front roller and the third front roller are respectively V_q1、V_q2And V_q3By regulating V on line_q1、V_q2And/or V_q3(ii) a The speed of the rear roller, the middle roller and the three front rollers can be adjusted and controlled on line, so that the online change of the combination modes of the decoration yarns and the core yarns, the online change of the combination modes of patterns such as knots, braids and loops, the online change of the sizes of the patterns such as the knots, the braids and the loops, the online change of the colors of the patterns such as the knots, the braids and the loops and the online change of the colors of the patterns such as the knots, the braids and the loops can be realized, and the combined fancy yarns with changeable appearance forms can.

Furthermore, the first component yarn, the second component yarn and the third component yarn are respectively led into the interactive twisting triangular area through a first front roller, a second front roller and a third front roller, wherein the component yarn (sliver) with the lowest speed of the front rollers is core yarn of fancy yarn, the component yarn with the higher speed of the front rollers is decorative yarn of the fancy yarn, and the online change of the combination mode of the decorative yarn and the core yarn in the fancy yarn is realized by adjusting the speeds of the first front roller, the second front roller and the third front roller on line; the specific regulation and control method comprises the following steps:

when V_q1(t):V_q2(t):V_q3(t) ═ 1:1 (1.15-1.3), the first component yarn (the finish yarn Y) was alternately twisted and kinked in the second component yarn and the third component yarn (the core yarn X)₁+X₂) Forming a knot thereon;

when V_q1(t):V_q2(t):V_q3When (t) is (1.4-4) to 1:1, the first component yarn (the finish yarn Y) is alternately twisted and twisted with the second component yarn and the third component yarn (the core yarn X)₁+X₂) Forming a ring on the upper part;

③ when V_q1(t):V_q2(t):V_q3(t) ═ 1:1 (0.90-0.75), second component yarn and third component yarn (decorative yarn X)₁+X₂) Intertwining and twisting the first component yarn (core yarn Y) to form knuckles;

d when V_q1(t):V_q2(t):V_q3(t) ═ 0.60-0.25):1:1, second component yarn and third component yarn (decorative yarn X)₁+X₂) Intertwining and twisting the first component yarn (core yarn Y) to form a braid or loop;

further, when V_q1(t):V_q2(t):V_q3When (t) ═ 0.4-0.25):1:1, the second component yarn and the third component yarn are decorative yarns (decorative yarn X)₁、X₂) The first component yarn is a core yarn; the second component yarn and the third component yarn are low twist yarns with a twist factor lower than 320, the second component yarn is alternately twisted and twisted on the first component yarn to form a first circle, and the third component yarn is alternately twisted and twisted on the first component yarn to form a second circle, thereby forming the double-circle fancy yarn;

second component yarn and third component yarn (finishing line X)₁、X₂) The thread density and the twist are equal, and the second component yarn and the third component yarn are respectively twisted and twisted on the first component yarn to form a symmetrical double-circle fancy thread; otherwise, respectively twisting and twisting the second component yarn and the third component yarn on the first component yarn to form an asymmetric double-circle fancy yarn;

i.e. the second groupPart yarn and third part yarn (finishing line X)₁、X₂) With unequal linear density and equal twist, or second component yarn and third component yarn (lace X)₁、X₂) Equal linear density, unequal twist, or second component yarn and third component yarn (finish X)₁、X₂) The yarn density is different, the twist is different, and asymmetric double-loop fancy yarns are formed on the first component yarns.

Further, V_q1(t):V_q2(t):V_q3When (t) ═ 0.4-0.25):1:1, the second component yarn and the third component yarn are decorative yarns (decorative yarn X)₁、X₂) The first component yarn (core yarn Y) is core yarn; the second component yarn and the third component yarn are strong twist yarns with the twist factor higher than 480, the second component yarn is alternately twisted and twisted on the first component yarn to form a first braid, and the third component yarn is alternately twisted and twisted on the first component yarn to form a second braid, so that the double-braid fancy yarn is formed;

the second component yarn and the third component yarn have equal density and twist, so that a symmetrical double-braid fancy yarn is formed; and the second component yarn and the third component yarn have unequal densities or twists, so that the asymmetric double-braid fancy yarn is formed.

Further, the method for regulating and controlling the pattern size of the fancy yarn comprises the following steps:

regulating size of yarn knot

When V is_q1(t):V_q2(t):V_q3When the ratio of (t) to (1.15-1.3) is 1:1, the first component yarn is a decorative yarn, and the second component yarn and the third component yarn are core yarns; first component yarn (decorative yarn Y)₁) Alternately twisting and twisting the second component yarn and the third component yarn as a core yarn (X)₁+X₂) Forming knots thereon; the linear density of the decorative yarn is as follows:

the speed V of the back roller is regulated and controlled by a PLC_h(t) the change of the thread density of the decoration yarn can be regulated and controlled, the thread density of the decoration yarn is increased when the feeding speed of the back roller is increased, and the thread density of the decoration yarn is reduced when the feeding speed of the back roller is reducedThe linear density of the decorative yarn is reduced. Thereby regulating and controlling the size of the formed fancy yarn knots to change on line;

② regulating and controlling size of fancy yarn ring

When V is_q1(t):V_q2(t):V_q3(t) ═ 1:1, (1.3-4) the first component yarn is a decorative yarn, and the second component yarn and the third component yarn are core yarns; first component yarn (decorative yarn Y)₁) Alternately twisting and twisting the second component yarn and the third component yarn as a core yarn (X)₁+X₂) Forming a loop thereon; the linear density of the decorative yarn is as follows:

the speed V of the back roller is regulated and controlled by a PLC_h(t), the change of the linear density of the decorative yarn can be regulated and controlled, the linear density of the decorative yarn is increased when the feeding speed of the back roller is increased, and the linear density of the decorative yarn is reduced when the feeding speed of the back roller is reduced;

meanwhile, the speed difference of the first front roller relative to the second front roller and the third front roller is regulated and controlled, and further the linear speed V of the decoration yarn is regulated and controlled_q1(t) relative core yarn V_q2(t)＝V_q3(t) overfeeding amount of linear velocity, under the condition of loop formation, if the decorative yarn is thick and the overfeeding amount is large, the loop is large, the decorative yarn is thin and the overfeeding amount is small, the loop is small, and therefore the size of the formed fancy yarn loop is regulated and controlled to change on line;

regulating and controlling thickness of fancy yarn plait

When V is_q1(t):V_q2(t):V_q3(t) 1 (1.3-4) when (1.3-4), the first component yarn is a core yarn, and the second component yarn and the third component yarn are decorative yarns; the second component yarn and the third component yarn are strong twist yarns (the twist coefficient is not less than 480), and the second component yarn and the third component yarn are immediately twisted on the first component yarn under the action of self twisting stress to form a braid;

the linear density of the second component yarn and the third component yarn as the decorative yarn is rho_x1、ρ_x2At the moment, the linear velocity V of the second component yarn and the third component yarn is regulated and controlled_q1(t)＝V_q2(t) speed of yarn relative to first componentV_q3(t), when the overfeeding amount is large, the braid is long, and when the overfeeding amount is small, the braid is short, so that the length of the formed fancy yarn braid can be regulated and controlled to change on line.

Further, the first component yarn, the second component yarn, the third component yarn and the solid yarn are yarns with different colors, and online change of the colors of the fancy yarns is realized by online adjustment of the wrapping structure, the wrapping ratio and/or the linear density of the fancy yarns.

The following explains the structural parameters of the fancy yarn formed by the alternating drafting, winding and twisting covered hollow spindle spinning system.

Let the linear density of the first component yarn (roving) as the decoration yarn, the density of the second component yarn (core yarn 1) and the density of the third component yarn and the linear density of the solid yarn be rho_s1、ρ_x1、ρ_x2、ρ_gAfter alternating drafting, alternate twisting and yarn-fixing covering, the linear density of the fancy yarn is rho_hySetting the speeds of the three front rollers, the rear roller and the middle roller in the spinning process and the core wire delivery speeds of the first extraction roller and the second extraction roller as V respectively_q1(t)、V_q2(t)、V_q3(t)、V_h(t)、V_z(t)、V_x1(t)、V_x2(t), C is 1.25, which is the speed ratio of the middle and rear rollers in each channel. After the alternate drafting, alternate twisting and yarn fixing cladding of the decorative yarn core yarn, the structural parameters of the formed fancy yarn are as follows:

1. linear density of decorative yarn

2. Linear density of core yarn:

3. linear density of the solid yarn:

ρ_g(t)＝ρ_g (3)

4. linear density and coating ratio of fancy yarn

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments or the description in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a hollow spindle fancy yarn forming device provided in embodiment 1 of the present invention;

fig. 2 is a schematic view of first to three passages of the hollow fancy yarn forming apparatus of example 1;

fig. 3 is a transmission structure diagram of a hollow spindle fancy yarn forming device provided in embodiment 1 of the present invention;

fig. 4 is a schematic circuit diagram of a hollow spindle fancy yarn forming device in embodiment 1 of the present invention;

fig. 5 is a circuit diagram of a comparison module in the hollow-spindle fancy yarn forming apparatus according to embodiment 3 of the present invention.

Reference numerals:

y-firstComponent yarn; x₁-a second component yarn; x₃-a third component yarn; g₁-fixing the yarns; r₁-a first draw-off roller; r₂-a second draw-off roller; r₃-a hollow spindle; d₁-a first twist point; d₂-a second twist point; 41-a back roller; 51-a first carrier gear; 61-middle roller; 71-a first front roller; 72-a second front roller; 73-a third front roller; 4-rear roller shaft; 5-an auxiliary shaft; 6-medium roller shaft; 7-front roller shaft; 8-a second front axle; 411 — a first drive gear; 611 — a first driven gear; 82-a second main gear; 721-a second counter gear; 83-third main gear; 731-third pinion; p₄-a posterior epithelial roll; p₆-an upper leather-in-roller; p₇-a pre-epithelial roller; q₁-an epithelial ring; q₂-a lower apron.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

As shown in FIGS. 1 to 3, the present embodiment provides a single draft channel hollow spindle yarn forming device, comprising a draft channel ABC for passing a first component yarn Y₁D₁D₂E. For second component yarn X₁First auxiliary passage R through₁C₂D₁D₂E and for fixing G₁Through yarn fixing passage R₃D₂E。

The draft channel is sequentially provided with a back roller 41, a middle roller 61, a first front roller 71 and a first twisting point D₁And a second twist point D₂(ii) a The first auxiliary channel is sequentially provided with a second front roller 72 and a first twisting point D₁And a second twist point D₂(ii) a The region between the back roller 41, the middle roller 61 and the first front roller 71 on the drafting channel is a drafting zoneAn alternate twisting triangular area is formed among the front roller 71, the second front roller 72 and the first twisting point; the first front roller 71 and the second front roller 72 respectively move independently and respectively introduce the corresponding component yarns into the interactive twisting triangular area; one or two of the first component yarn and the second component yarn are led to the alternate twisting triangular area and then twisted to form the fancy yarn main body. Second twist point D₂Is provided with a hollow spindle R₃The main body of the fancy yarn passes through the hollow spindle R₃Hollow spindle R₃Fast rotating, hollow spindle R₃The upper fixed yarn is crossed with the fancy yarn main body and wraps the fancy yarn main body.

The embodiment also comprises a filament bobbin (not shown), the filament bobbin is sleeved on the hollow spindle and synchronously rotates along with the hollow spindle, and the fixed yarn is wound on the filament bobbin. The hollow spindle comprises a false twister (not shown) for twisting the body of fancy yarn.

The back roller 41 and the middle roller 61 are connected through a first transmission gear set, and the first transmission gear set is used for keeping the traction ratio between the middle roller 61 and the back roller 41 constant and not more than 1.4.

The utility model provides a form one-level draft unit between well roller 61 and the back roller 41, preceding roller constitutes the second grade draft unit with well roller 61, and the well 41 velocity ratio of back roller of same passageway is invariable and be less than 1.4 to and the synchronous variable speed of preceding roller in this passageway relatively, the well, back roller 41 of different passageways roller variable speed in turn before relatively, realize the alternation draft to first component yarn. Of particular importance, first orderThe draft is pre-draft with a primary draft ratio e_hConstant C is constant draft, draft ratio e of primary draft_hC is less than or equal to 1.4, the continuity of the roving can be ensured, and no drafting singular point can be generated in the first drafting zone. Meanwhile, the fiber in the roving can be straightened, tensioned and oriented in the pre-drafting process, so that the preparation for slippage in the main drafting process is made, the end breakage rate or the singular point rate in the main drafting process is reduced, the drafting and twisting process is more stable, and the labor intensity of workers is greatly reduced.

The first front roller 71 and the second front roller 72 are coaxially and radially arranged and are relatively rotatable in the circumferential direction.

In the above embodiment, more preferably, the yarn for the third component yarn X is further included₂Second auxiliary passage R through₂C₃D₁D₂E; a third front roller 73 and a first twisting point D are sequentially arranged on the second auxiliary channel₁And a second twist point D₂. The third front roller 73 and the second front roller 72 are fixed relative to each other in the circumferential direction.

The first auxiliary channel also comprises a first extraction roller R₁(first unwinding shaft), the first drawing roller, the second front roller 72, the first twisting point and the second twisting point are arranged in sequence; the second auxiliary channel also comprises a second extraction roller R₂(second unwinding shaft), second take-off roller R₂The third front roller 73, the first twist point and the second twist point are arranged in this order.

The back roller, the middle roller and the front roller are respectively provided with a back upper leather roller P₄Middle and upper leather roller P₆And a front upper leather roller P₇. An upper middle leather roller P is correspondingly arranged above the middle roller 61₆The yarn forming device also comprises an upper leather ring Q which is sleeved on the upper leather roller and the upper pin and keeps synchronous movement with the middle roller 61₁A lower leather ring Q sleeved on the middle roller 61 and the lower pin and keeping synchronous movement with the middle roller 61₂(ii) a The distance between the holding jaw of the upper leather ring and the holding jaw of the lower leather ring and the front roller jaw line is less than 3 mm.

Two stage draft e_qFor dynamic main draft, the speed of the middle roller 61 is changed relative to the front roller,when the blending ratio K of the first component yarn in the drafting channel is 0 percent, the second-level drafting ratio e of the channel yarn_qWhen the yarn is matched well, coarse details or broken ends of the spun yarn are generated, so that the spun yarn becomes an unstable process, and the reliability and the quality of the spun yarn are influenced. When K is gradually increased, the slivers held by the upper and lower leather rings are instantaneously fed into the jaw of the front roller to carry out secondary drafting along with the synchronous start of the rear roller 41 and the middle roller 61, so that the drafting singular points in the secondary drafting zone can not influence the stability of spinning.

The present embodiment further comprises a rear roller shaft 4, a middle roller shaft 6, a front roller shaft 7 and an auxiliary shaft 5; in the circumferential direction of the rear roller shaft 4, the rear roller 41 is movably sleeved on the rear roller shaft 4 (for example, by means of a bearing) in a relatively rotatable manner; in the circumferential direction of the middle roller shaft 6, the middle roller 61 can be movably sleeved on the middle roller shaft 6 in a relative rotation way; the first transmission gear set comprises a first driving gear 411, a first intermediate gear 51 and a first driven gear 611 which are in meshing transmission in sequence; the first driving gear is fixedly connected with the rear roller 41 in the same axle center, and the first driven gear is fixedly connected with the middle roller 61 in the same axle center; the first intermediate gear 51 is fitted relatively fixedly on the auxiliary shaft 5. Thus, the rear roller 41 and the middle roller 61 can be synchronously driven to run through the auxiliary shaft 5, and the feeding speed of the first component yarn can be adjusted.

In the circumferential direction of the front roller shaft 7, the first front roller 71 is relatively fixedly sleeved on the front roller shaft 7; the second front roller 72 and the third front roller 73 are rotatably fitted around the front roller shaft 7.

The embodiment also comprises a second front shaft 8, and the second front shaft 8 is connected with the second front roller 72 through a second gear transmission pair; the second front shaft 8 is connected with the third front roller 73 through a third gear transmission pair; the second front roller 72 and the third front roller 73 can be synchronously driven to rotate by the second front shaft 8.

The second gear transmission pair comprises: a second main gear 82 and a second auxiliary gear 721 which are in meshing transmission with each other, wherein the second main gear is fixedly sleeved on the second front shaft 8, and the second auxiliary gear is fixedly connected with the second front roller 72 in a coaxial manner; the third gear transmission pair comprises: a third main gear 83 and a third pinion 731 which are meshed with each other for transmission, the third main gear is fixedly sleeved on the second front shaft 8, and the third pinion is fixedly connected with the third front roller 73 in a coaxial manner.

Referring to fig. 4, the present embodiment further includes a control system and a servo driving system; the servo driving system comprises a servo driver and a servo motor; the control system comprises a controller (preferably a PLC programmable controller) and a rotation speed sensor. The controller is connected with the servo motor through the servo driver in sequence.

The servo motor includes: the first servo motor is used for driving the front roller shaft 7, the second servo motor is used for driving the second front shaft 8, the third servo motor is used for driving the auxiliary shaft 5 to rotate, the fourth servo motor is used for driving the first extraction roller to rotate, the fifth servo motor is used for driving the first extraction roller to rotate, and the hollow spindle motor is used for driving the hollow spindle to rotate.

The rotation speed sensor includes: the first sensor, the second sensor, the third sensor, the fourth sensor and the fifth sensor are used for monitoring the rotating speeds of the front roller shaft 7, the second front shaft 8, the auxiliary shaft 5, the first leading-out roller and the second leading-out roller respectively, and the hollow spindle sensor is used for monitoring the rotating speed of the hollow spindle.

The utility model provides a controller loops through the feeding speed of four component yarns on four yarn passageways of servo driver and servo motor control, and the actual feeding speed of four component yarns of rotational speed sensor real-time supervision to feed back the monitoring value to the controller, the controller can be according to the size of control signal on four yarn passageways of monitoring value adjustment. The twisting mechanism comprises a ring plate, and the controller controls the ring plate to move through a servo driver and a servo motor. In addition, the control system also includes a series of instructions and modular programs.

Example 2

The embodiment also discloses a fancy yarn forming method adopting the single-drafting-channel hollow spindle fancy yarn forming device.

1. Spinning of hollow spindle fancy yarn formed by one-step twisting of decorative yarn, core yarn and solid yarn

2. Fancy yarn with on-line changing wrapping structure

The speeds of the rear roller, the middle roller and the three front rollers are regulated and controlled on line, so that the fancy yarns of the single-twist coating structure, the fancy yarns of the alternate-twist coating structure and the fancy yarns of the winding-twisting coating structure can be respectively spun by cooperatively inputting the decorative yarns and the core yarns;

Firstly, spinning fancy yarns with a cross-twisting wrapping structure:

the twisted yarn covering structure of an effect yarn is a structure of an effect yarn formed by twisting two untwisted strands (or yarns) at a constant speed at a first twisting point and covering the untwisted strands (or yarns) with a fixed yarn at a second twisting point.

The utility model discloses in the device, roller before first preceding roller, second and third are corresponded respectively to draft passageway (main entrance), first auxiliary passage and second auxiliary passage, because roving Y₁The yarn X is output by a first front roller after being alternately drafted by the main channel₁Through the first auxiliary channel from the secondFront roller delivery of yarn X₂Is delivered out of the third front roller through the second auxiliary channel. Roving Y₁The output strands under the condition of alternating drafting are intermittent, when the linear density of the strands output by the main channel is zero, the two front rollers corresponding to the two auxiliary channels output two strands at a constant speed to be twisted at a first twisting point, and the fixed threads G output by the yarn fixing channel at a second twisting point₁The coating forms a twisted and coated fancy yarn structure. For example, [ (X) can be formed in this way₁+X₂)+G₁]The fancy yarn of the twisted covering structure.

Secondly, the fancy yarn with the winding and twisting coating structure is spun:

the twisted and covered structure of the effect yarn is a structure of the effect yarn formed by twisting three or more untwisted strands (or yarns) at a first twist point at a non-constant speed and covering the untwisted strands (or yarns) with a solid yarn at a second twist point.

The utility model discloses in the device, roller and third front roller before draft passageway and first auxiliary passage, second auxiliary passage correspond first front roller, second, because roving Y is exported by first front roller after main entrance reversal draft, yarn X₁、X₂The yarn is output at constant speed through a second front roller and a third front roller corresponding to the first auxiliary channel and the second auxiliary channel, and two yarns (or filaments) (X) are output at a first twisting point₁+X₂) And the yarn is twisted with a non-twist strand (roving Y) at a non-constant speed to form a twisting structure, and the twisting structure is coated by a fixed yarn G output by a yarn fixing channel at a second twisting point to form a twisting and coating fancy yarn structure. In this way [ Y ] can be formed₁+(X₁+X₂)+G₁]The fancy yarn of the twist-and-wrap structure of (1).

3. Spinning of fancy yarn with on-line variation of shape

The speeds of the first front roller, the second front roller and the third front roller are respectively set to be V_q1、V_q2And V_q3By regulating V on line_q1、V_q2And/or V_q3(ii) a By regulating the speed of the back roller, the middle roller and the three front rollers on line, the on-line change of the combination mode of the decoration yarns and the core yarns and the combination of patterns such as knots, braids, loops and the like can be realizedThe online change of the mode, the online change of the sizes of the patterns such as knots, braids, loops and the like, and the online change of the colors of the patterns such as knots, braids, loops and the like, spin the combined fancy yarns with changeable appearance forms.

Fancy yarn spinning with decoration yarn and core yarn combined mode changing on line

The first component yarn, the second component yarn and the third component yarn are respectively introduced into the interactive twisting triangular area through a first front roller, a second front roller and a third front roller, wherein the component yarn (strand) with the lowest speed of the front rollers is core yarn of fancy yarn, the component yarn with the higher speed of the front rollers is decoration yarn of the fancy yarn, and the online change of the combination mode of the decoration yarn and the core yarn in the fancy yarn is realized by adjusting the speeds of the first front roller, the second front roller and the third front roller on line.

Wherein, the first component yarn (roving Y) is alternately drafted by a drafting channel and then passes through a first front roller with V_q1(t) outputting, second component yarn and third component yarn (yarn X)₁、X₂) From the second front roller and the third front roller by V_q2(t)＝V_q3(t) speed output.

Generally, the strands with the lowest speed become core yarns of the effect yarns, and the strands with relatively higher speed become decoration yarns of the effect yarns. When V is_q2(t)＝V_q3(t)≤V_q1(t) minimum, X₁、X₂Is core yarn, Y is decorative yarn; when V is_q3(t)＝V_q2(t)≥V_q1When (t), Y is a core yarn, X₁、X₂Is a decorative yarn. Thus, V is regulated by PLC_q1(t)、V_q2(t)、V_q3(t) the online change of the combination mode of the decoration yarns and the core yarns can be realized.

Secondly, the fancy yarns with patterns such as knots, braids, loops and the like combined for on-line change are spun

spinning of three-circle fancy yarn

When V is_q1(t):V_q2(t):V_q3When (t) ═ 0.4-0.25):1:1, the second component yarn and the third component yarn are decorative yarns (decorative yarn X)₁、X₂) The first component yarn is a core yarn; the second component yarn and the third component yarn are low twist yarns with a twist factor lower than 320, the second component yarn is alternately twisted and twisted on the first component yarn to form a first circle, and the third component yarn is alternately twisted and twisted on the first component yarn to form a second circle, thereby forming the double-circle fancy yarn;

i.e. second component yarn and third component yarn (molding X)₁、X₂) With unequal linear density and equal twist, or second component yarn and third component yarn (lace X)₁、X₂) Equal linear density, unequal twist, or second component yarn and third component yarn (finish X)₁、X₂) The yarn density is different, the twist is different, and asymmetric double-loop fancy yarns are formed on the first component yarns.

Spinning of double-braid fancy yarn

V_q1(t):V_q2(t):V_q3When (t) ═ 0.4-0.25):1:1, the second component yarn and the third component yarn are decorative yarns (decorative yarn X)₁、X₂) The first component yarn (core yarn Y) is core yarn; the second component yarn and the third component yarn are strong twist yarns with the twist factor higher than 480, the second component yarn is alternately twisted and twisted on the first component yarn to form a first braid, and the third component yarn is alternately twisted and twisted on the first component yarn to form a second braid, so that the double-braid fancy yarn is formed;

If the decorative line X₁、X₂If the thread density and the twist are equal, forming a symmetrical double-braid fancy thread; if the decorative line X₁、X₂Unequal thread density, equal twist, or a decorative thread X₁、X₂Equal thread density, unequal twist, or a decorative thread X₁、X₂Asymmetric double-braid fancy yarns can be formed when the linear density and the twist are different;

weaving of fancy yarns with patterns of sizes changed on line such as knots, braids, loops and the like

The sizes of patterns such as knots, plaits, loops and the like of the fancy yarns depend on the thicknesses and twists of the decorative yarns and the core yarns and the overfeed speed of the decorative yarns relative to the core yarns. When forming knots, the fancy yarn with large decorative yarn coarse twist is larger than the fancy yarn with small decorative yarn fine twist; when the circles are formed, the fancy yarn with the large overfeed ratio of the thick twist of the decorative yarn is larger than the fancy yarn with the small overfeed ratio of the thin twist of the decorative yarn, and the circles formed by twisting are larger; when the plait is formed, the fancy yarn with the large overfeed ratio of the thick twist of the decorative yarn is longer than the fancy yarn with the small overfeed ratio of the thin twist of the decorative yarn.

Regulating size of yarn knot

When V is_q1(t):V_q2(t):V_q3When (t) ═ 1:1, (1.15-1.3), the first component yarn isThe decoration yarns, the second component yarns and the third component yarns are core yarns; first component yarn (decorative yarn Y)₁) Alternately twisting and twisting the second component yarn and the third component yarn as a core yarn (X)₁+X₂) Forming knots thereon; the linear density of the decorative yarn is as follows:

the speed V of the back roller is regulated and controlled by a PLC_h(t), the change of the linear density of the decorative yarn can be regulated and controlled, the linear density of the decorative yarn is increased when the feeding speed of the back roller is increased, and the linear density of the decorative yarn is reduced when the feeding speed of the back roller is reduced. Thereby regulating and controlling the size of the formed fancy yarn knots to change on line;

② regulating and controlling size of fancy yarn ring

regulating and controlling thickness of fancy yarn plait

When V is_q1(t):V_q2(t):V_q2(t) 1 (1.3-4) when (1.3-4), the first component yarn is a core yarn, and the second component yarn and the third component yarn are decorative yarns; the second component yarn and the third component yarn are strong twist yarns (the twist coefficient is not less than 480), and the second component yarn and the third component yarn are immediately twisted on the first component yarn under the action of self twisting stress to form a braid;

the linear density of the second component yarn and the third component yarn as the decorative yarn is rho_x1、ρ_x2At the moment, the linear velocity V of the second component yarn and the third component yarn is regulated and controlled_q1(t)＝V_q2(t) speed V of yarn relative to first component_q3(t), when the overfeeding amount is large, the braid is long, and when the overfeeding amount is small, the braid is short, so that the length of the formed fancy yarn braid can be regulated and controlled to change on line.

3. Spinning of fancy yarn with online change of coating ratio and linear density

The first component yarn, the second component yarn, the third component yarn and the solid yarn are yarns with different colors, and the online change of the colors of the fancy yarns is realized by online adjusting the wrapping structure, the wrapping ratio and/or the linear density of the fancy yarns.

The fancy yarn is formed by mutually wrapping core yarn, decorative yarn and solid yarn, and when the wrapping structure and the wrapping proportion are changed on line, the color of the fancy yarn is changed on line. If four slivers are fed in two twisting processes rho according to equations (6) (7) (8) (9) (10)_s1、ρ_x1、ρ_x2、ρ_gThe colors of red, yellow, blue, black and the like are respectively adopted, and the colors of the fancy yarn can be adjusted and controlled by changing the cladding ratio. Let the linear density of the fancy yarn be rho_hy(t) the covering ratio of the effect yarn is K_h1(t)、K_h2(t)、K_h3(t)、K_h4(t) of (d). Then

Then the servo motor is regulated and controlled by the PLC and drives the V_h(t)、V_q1(t)、V_q2(t)、V_q3(t)、V_x1(t)、V_x2(t), the online variation of the density and the coating ratio of the fancy yarn can be regulated and controlled.

Example 3

The structure of the present embodiment is substantially the same as that of embodiment 1, except that:

as shown in fig. 5, the control system further includes a first comparison module, the first comparison module is respectively connected to the third sensor, the fourth sensor, the fifth sensor and the controller, the first comparison module is used for monitoring a rotation speed ratio among the auxiliary shaft, the first drawing roller and the second drawing roller, and the controller regulates and controls the rotation speeds of the auxiliary shaft, the first drawing roller and the second drawing roller according to a value fed back by the first comparison module, so as to regulate and control a blending ratio of the first component yarn, the second component yarn and the third component yarn.

Realize yarn blending ratio regulation and control for the accuracy fast, the utility model discloses direct numerical value according to first comparison module feedback is regulated and control, even lead to auxiliary shaft, first draw roller and second to draw the roller rotational speed and surpass respectively and set for error range because of various error reasons, as long as guarantee that the rotational speed ratio of first comparison module feedback is in setting for error range, can continue production and need not additionally adjust the actual rotational speed of well roller axle 6 and back roller axle 4. Compared with the prior art, need monitor a plurality of parameters simultaneously and compare, the utility model discloses only need monitor a parameter, relaxed the auxiliary shaft, first draw forth roller and second and draw forth the regulation and control precision of roller rotational speed, increased system control's redundancy, and outstanding the importance of roller rotational speed ratio on the different passageways, still improved the blending ratio control precision of yarn greatly when the work load greatly reduced that the controller handled, in addition, the shut down or the adjust time in having avoided the production process, the production efficiency of equipment improves more than 30%.

The comparison module may be a conventional comparator, an integrated comparison circuit, or a comparison module in software in the controller cpu. The sensor may be in many forms, such as a photoelectric encoder or a hall revolution sensor.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The single-drafting-channel hollow spindle fancy yarn forming device is characterized by comprising a drafting channel and a first auxiliary channel, wherein the drafting channel is used for a first component yarn to pass through, and the first auxiliary channel is used for a second component yarn to pass through; the drafting channel is sequentially provided with a rear roller, a middle roller, a first front roller, a first twisting point and a second twisting point; the first auxiliary channel is sequentially provided with a second front roller, the first twisting point and the second twisting point;

2. The hollow fancy yarn forming device of claim 1, wherein the rear roller and the middle roller are connected through a first transmission gear set, and the first transmission gear set is used for keeping a traction ratio between the middle roller and the rear roller constant and not more than 1.4.

3. The hollow fancy yarn forming apparatus of claim 1, further comprising a third component yarn, and a second auxiliary channel for the third component yarn to pass through; a third front roller, the first twisting point and the second twisting point are sequentially arranged on the second auxiliary channel; one or two of the first component yarn, the second component yarn and the third component yarn are led to the alternating twisting triangular area and then twisted to form the fancy yarn main body.

4. The hollow-spindle fancy yarn forming apparatus as claimed in claim 3, wherein the third front roller and the second front roller are fixedly disposed relative to each other in a circumferential direction.

5. The hollow fancy yarn forming device of claim 3, wherein the first auxiliary channel further comprises a first draw-out roller, and the first draw-out roller, the second front roller, the first twisting point and the second twisting point are sequentially arranged;

and/or the second auxiliary channel further comprises a second leading-out roller, the third front roller, the first twisting point and the second twisting point are sequentially arranged.

6. The hollow fancy yarn forming apparatus of claim 2, further comprising a rear roller shaft, a middle roller shaft and an auxiliary shaft;

in the circumferential direction of the rear roller shaft, the rear roller can be movably sleeved on the rear roller shaft in a relative rotation manner;

7. The hollow fancy yarn forming apparatus of claim 4, further comprising a front roller shaft;

8. The hollow-spindle fancy yarn forming device as claimed in claim 7, further comprising a second front shaft connected to the second front roller through a second gear pair; the second front shaft is connected with the third front roller through a third gear transmission pair; the second front roller and the third front roller can be synchronously driven to rotate through the second front shaft.

9. The hollow-boule fancy yarn forming apparatus of claim 8, wherein the second gear transmission pair comprises: the second main gear and the second auxiliary gear are in meshed transmission with each other, the second main gear is fixedly sleeved on the second front shaft, and the second auxiliary gear is fixedly connected with the second front roller in a coaxial manner;